Stop registering the MapLibre 5 UMD build on event detail pages

The event detail page was the last place still loading MapLibre 5. Its
theme template now imports maplibre-gl.mjs as an ES module, so the
listener no longer needs to register the UMD bundle.

pmtiles stays a classic script: it only has to provide an IIFE global
for addProtocol. The stylesheet registration is unchanged.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/EventListener/EventFullTemplateDataListener.php

@@ -228,8 +228,10 @@ class EventFullTemplateDataListener
         $GLOBALS['TL_JAVASCRIPT'] ??= [];
         $GLOBALS['TL_CSS'] ??= [];
 
+        // MapLibre wird vom Theme-Template als ESM importiert (maplibre-gl.mjs zieht
+        // -shared.mjs und -worker.mjs selbst nach). pmtiles bleibt klassisch, weil es
+        // nur ein IIFE-Global fuer addProtocol bereitstellen muss.
         $jsAssets = [
-            'https://maps.mummert.media/libraries/maplibre-gl.js',
             'https://maps.mummert.media/libraries/pmtiles.js',
         ];